Loading…
Perception of low red:far‐red ratio compromises both salicylic acid‐ and jasmonic acid‐dependent pathogen defences in A rabidopsis
In dense stands of plants, such as agricultural monocultures, plants are exposed simultaneously to competition for light and other stresses such as pathogen infection. Here, we show that both salicylic acid ( SA )‐dependent and jasmonic acid ( JA )‐dependent disease resistance is inhibited by a simu...
Saved in:
Published in: | The Plant journal : for cell and molecular biology 2013-07, Vol.75 (1), p.90-103 |
---|---|
Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | In dense stands of plants, such as agricultural monocultures, plants are exposed simultaneously to competition for light and other stresses such as pathogen infection. Here, we show that both salicylic acid (
SA
)‐dependent and jasmonic acid (
JA
)‐dependent disease resistance is inhibited by a simultaneously reduced red:far‐red light ratio (
R
:
FR
), the early warning signal for plant competition. Conversely,
SA
‐ and
JA
‐dependent induced defences did not affect shade‐avoidance responses to low
R
:
FR
. Reduced pathogen resistance by low
R
:
FR
was accompanied by a strong reduction in the regulation of
JA
‐ and
SA
‐responsive genes. The severe inhibition of
SA
‐responsive transcription in low
R
:
FR
appeared to be brought about by the repression of
SA
‐inducible kinases. Phosphorylation of the
SA
‐responsive transcription co‐activator
NPR
1, which is required for full induction of
SA
‐responsive transcription, was indeed reduced and may thus play a role in the suppression of
SA
‐mediated defences by low
R
:
FR
‐mediated phytochrome inactivation. Our results indicate that foraging for light through the shade‐avoidance response is prioritised over plant immune responses when plants are simultaneously challenged with competition and pathogen attack. |
---|---|
ISSN: | 0960-7412 1365-313X |
DOI: | 10.1111/tpj.12203 |